{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Principal",
  "type": "object",
  "description": "Represents a principal (user or service principal) that performed an action.",
  "properties": {
    "id": {
      "type": "string",
      "description": "The unique identifier of the principal."
    },
    "displayName": {
      "type": "['string', 'null']",
      "description": "The display name of the principal."
    },
    "type": {
      "type": "string",
      "description": "The type of principal."
    },
    "tenantId": {
      "type": "['string', 'null']",
      "description": "The tenant ID of the principal."
    }
  }
}